Bush Hog GT 48 manual Hub Bearing Replacement, Blade Replacement, Troubleshooting

C. Turn adjusting nut counterclockwise and slide engine rearward. Remove old belt.

D. Install new belt onto pulleys. Do not pry belt onto pulley.

E. Turn adjusting nut clockwise to tighten belt. Place enough tension on belt to allow not more than 1/2” and not less than 1/4” deflection.

F. Tighten four engine stand bolts. G. Reinstall belt shield.

3-4 HUB BEARING REPLACEMENT

A. Remove belt shield. (Figure 3-2)

B. Loosen engine mount and remove belt.

C. Loosen set screws and remove 7/16” bolt. Remove pulley from spindle. Do not lose key.

D. Remove the six nuts securing hub assembly to deck.

E. Remove upper nut to free spindle retaining nut. (Figure 3-3)

F. Lift out bushing.

G. Tap spindle out of hub.

H. Remove grease seals and bearings.

I. Check bearing cups inside hub for damage. If damaged, tap out cup(s), perform step “J” below, then insert new cup(s).

J. Clean inside of hub with suitable solvent.

NOTE

Check to see if blade needs sharpening or replacing.

K. Insert lower bearing and seal into hub.

L. Install spindle into hub taking care not to dam- age grease seal.

M. Insert upper bearing, seal and bushing into hub. Seal should be installed with metal face against bear- ing to allow grease to purge outward from bearing.

N. Place nut onto spindle. Tighten nut until it takes

Figure 3-3

Hub And Blade

Assembly

Hex Nut

Lockwasher

1/2 x 2” Capscrew

Lockwasher

Hex Jam Nut

Cotter Pin

3/4 x 2-1/4” Blade Bolt

Hex Nuts

Bushing

Oil Seal

Bearing Cone

Outer Bearing Cup

Hub Assembly

Inner Bearing Cup

Bearing Cone

Seal, Triple Lip

Shaft, Spindle

Key

Blade Bar

Slotted Nut

Uplift Blade

7-12 in.lbs. (.79 - 1.35Nm) to turn blade. To measure, place torque wrench on nut and turn blade while reading gauge. If nut is too tight, loosen nut two full turns; tap lightly on top of spindle, then retighten. After nut is tightened, install jam nut as shown.

NOTE

If a torque wrench is not available, tighten nut until there is no vertical movement in spindle. Make cer- tain blade will spin freely.

O. Using a grease gun, fill inside of hub with multi-purpose grease. Pump in through grease fitting until grease expels out of upper seal.

P. Install hub assembly to deck and pulley to spindle.

Q. Install belt and adjust per paragraph 3-2. R. Install belt shield.

3-5 BLADE REPLACEMENT

Remove old blades. Install new blades with uplift positioned as shown in Figure 3-3. Torque 3/4 x 2- 1/4” bolts to 297 ft./lbs. and 1/2 x 2” bolts to 76 ft./lbs. Wear heavy gloves to protect hands.

3-6 TROUBLESHOOTING

Troubleshooting procedures are listed in Table 3-1 below. If the problem cannot be solved or replace- ment parts are necessary, contact your authorized Bush Hog dealer. Please have ready your machine name, model number, serial number, purchase date and exact cause or description of problem.

WARNING

BEFORE PERFORMING MAINTENANCE INSPECTIONS OR WORK ON CUTTER, SHUT CUTTER ENGINE OFF AND DISCONNECT SPARK PLUG WIRE. FAILURE TO DO SO COULD RESULT IN ACCIDENTAL STARTING OF ENGINE CAUSING POSSIBLE INJURY OR DEATH.

NOTE

Engine warranty, service and parts must be obtained through an authorized service center for Honda engines.

13